Needle-bar device with double needle action in fancy-stitching sewing machine



April 15, 1969 3,438,347 ACTION IN R BUNSAKU TAKETOMI NEEDLE-BAR DEVICEWITH DOUBL EWI E NEEDLE v FANGY-STITCHING S NG MACHI Filed Feb. 5, 1967Sheet mv ENTQR a4 n-rw-o NEYS Aprll 1969 BUNSAKU TAKETOMI 3, 3 ,3NEEDLE-BAR DEVICE WITH DOUBLE NEEDLE ACTION IN FANCY-STITCHING SEWINGMACHINE Filed Feb. [5,1967 Sheet 3 012 INVINTOR E BUNSAKU TAKEToMi am-WmATTORNEYS United States Patent 3,438,347 NEEDLE-BAR DEVICE WITH DOUBLENEEDLE ACTION IN FANCY-STITCH- ING SEWING MACHINE Bunsaku Taketomi, 2-9Uchiyama-cho, Chikusa-ku, Nagoya-shi, Aichi-ken, Japan Filed Feb. 3,1967, Ser. No. 613,929 Claims priority, application Japan, Nov. 1, 1966,41 72 294 Int. Cl. Db 3'/02, 55/10 US. Cl. 112-158 2 Claims ABSTRACT OFTHE DISCLOSURE This invention relates to a fancy-stitching sewingmachine and more particularly to the improvement of needlebar deviceswith double needle action by use of which figures, letters and the likecan be automatically stitched.

One of the objects of the present invention is to provide needle-bardevices with double needle action in a fancystitching sewing machinewhereby patterns asymmetrical as well as symmetrical with respect to theleft and the right can be effectively stitched without turning backcloths to be sewn and interrupting needle motion.

Other objects, principle and details will become clear from thefollowing description with respect to the preferred embodiments taken inconjunction with the appended drawings.

Referring to the drawings:

FIG. 1 is a front view partly in section of the needle-bar deviceaccording to the present invention connected to a sewing machine, partof said sewing machine being omitted;

FIG. 2 is a side elevation partly in section of said needle-bar devicewith the left needle and the left needle holder removed;

FIG. 3 is a perspective view of a pair of zigzag controlling rods;

FIG. 4 is a top plane view of a fiat plate to which a pair of needleholders are connected;

FIG. 5 is a perspective view of a needle holder;

FIG. 6 is a diagram showing some examples of patterns which can beeasily sewn by use of the device according to the invention;

FIG. 7 is a perspective view of a pair of needle holders which are sowformed as to be pivotally supported by a common pin in an overlappedposition;

FIG. 8 is a sectional view of another embodiment embodying needleholders and the oscillating mechanism thereof;

FIG. 9 is a front elevation of the device shown in FIG.

horizontal arms 11, 11" and 11'. In axial holes bored respectivelythrough horizontal arms 11" and 11" there is s-lidably inserted aneedle-bar 13 said needle-bar being caused to move up and down as in thecase of an ordinary sewing machine by the crank rod 14 which rotatestogether with the main shaft 14 of the sewing machine.

At the lower end of the needle-bar 13, as best shown in FIGS. l-2, thereis attached thereto a fiat plate 15. On the bottom surface of the flat.plate 15, there are pivotally supported right and left needle holders16a and 16b by means of pins 17, each of the needle holders having aninverted L shape with horizontal and vertical portions. The uppersurfaces of said horizontal portions are formed flat so as to be inclose contact with the lower surface of the fiat plate 15. Further, inorder to ensure said contact, metal fittings of inverted L shape 18a and18b are screwed down to the vertical portions of said needle holders 16aand 16b respectively by means of screws 19, whereby needle holders 16aand 1611 can smoothly oscillate in a horizontal plane about pins 17respectively as pivots.

To the lower ends of the needle holders 16a and 16b are attached needles20a and 2012, respectively, by means of setscrews 21, said needles 20aand 20b moving up and down together with the needle-bar 1 3 andoscillating to the right and the left individually according to theoscillatory motion of the needle holders 16a and 16b respectively, thelower ends of said needles 20a and 20b going into and out of thevertically rotating shuttle 22.

In the axial holes bored through the horizontal arm 11' of thesupporting frame 11 are rotatably inserted rotating sleeves 23a and 23bsymmetrical with respect to the needlebar 13. At the upper ends of therotating sleeves 23a and 23b there are integrally formed therewithconnecting arms 23'a and 23'b, to one end portion of which are pivotallyconnected connecting rods 24a and 24b, respectively. The pivotallyconnected end portions of said connecting rods 24a and 24b, which areactuated by the zigzag generating device (not shown) in the sewingmachine, oscillate independently in a horizontal plane whereby saidrotating sleeves 23a and 23b are turned righthandedly or lefthandedly.In the hollow interior of the rotating sleeve 23:: is inserted a zigzagcontrolling rod 25a, whose horizontally bent upper portion is fitted inthe axial slot made through the rotating sleeve 23a so that said zigzagcontrolling rod 25a may rotate together with the rotating sleeve 23a andmove up and down independently of it.

The lower end portion of the zigzag controlling rod 25a, being insertedthrough hole 15a bored through the flat plate 15, is bent to form ahorizontal shoulder portion 25'a and a hook portion 25"a, which arepositioned in the groove 16a made on the upper surface of the horizontalportion of the needle holder 16a. Thus, when the zigzag controlling rod25a rotates, said horizontal shoulder portion 25a causes the needleholder 16a to oscillate about the pin 17 as a pivot. Quite similarly isdisposed the zigzag controlling rod 25b associated with the needle 2017between the rotating sleeve 23b and the needle holder 16b.

In a sewing machine provided with the present needlebar device, theright and the left needles 20a and 20b oscillate individually in ahorizontal plane according to the zigzag generating device while theymove together up and down and thus, asymmetrical patterns, for example,as shown in FIG. 6, as well as symmetrical ones can be easily stitched.If necessary, the needles 20a and 20b may oscillate beyond the centerline of patterns to be stitched so that the sweeping regions of bothneedles 20a and 20b partly overlap each other.

When the shuttle 22 of the sewing machine rotates horizontally as shownin FIG. 7, the right and the left needle holders 26a and 26b arepivotally supported by a common pin 17a in an overlapped position at thebottom surface of the needle-bar 13. In this case, the radius of thecircle described by the needle 20'a or 20"b is set equal to that of thecircle described by the bill edge of the shuttle 22.

Also, needle holders and the mechanism to oscillate them individually ina horizontal plane may be constructed as shown in FIGS. 8-10. Referringto these figures, in the base 28 fixed at the lower end of theneedle-bar 27 there is a horizontal slot 28 with a circular crosssection at right angles to the direction of movement of the cloth to bestitched, the lower part of said slot 28' opening to the bottom surfaceof the base 28 through an opening narrower than said slot 28'. In theslot 28' and said opening are slidably fitted right and left needleholders 29a and 29b of the form as shown in FIG. 10. Needles 20"a and20"b are attached to the right and the left needle holders 29a and 291;,respectively, by means of setscrews 32a and 32b. Said needles 20"a and20"b move up and down together with the needle-bar 27 and are caused toindividually move linearly by the sliding motion of the needle holders29a and 2%, respectively. Next, slots 30a and 30b are made in the upperportions of the needle holders 29a and 29b, respectively, at rightangles to the direction of the sliding motion of the needle holders 29aand 2%. Under the extending portion 28" of the base 28, operating arms31a and 31b are fitted to the slots 30a and 3012 through openings 28"aand 28"b respectively. The end portions of said operating arms 31'a and31 h being fixed, respectively, to the lower ends of the zigzagcontrolling rods 31a and 31b inserted rotatably in axial holes borethrough said extended portion 28" so as to cause linear sliding motionof the needle holders 29a and 2% by the rotating motion of the zigzagcontrolling rods 31a and 31b. The upper end of the needle-bar 27 andthose of zigzag controlling rods 31a and 31b are connected to the mainshaft of the sewing machine and the zigzag generating devicerespectively quite similarly as in the case of the previous embodiment.

As seen clearly from the foregoing, by use of the needlebar device withdouble needle action according to the present invention, evenasymmetrical patterns can he stitched easily and efficiently withoutturning back the cloth and interrupting the motion of the needle, whichis impossible in the use of a conventional needle-bar device where theright and the left needles oscillate symmetrically with respect to eachother.

Although the above description was stated with respect to the preferredembodiments, it should be understood that many changes and modificationscan be made Without departing from the scope of the invention as definedin the appended claims.

What I claim is:

1. In a sewing machine having a main shaft, a housing and a mechanismfor providing fancy stitching, a needlebar device with double needleaction comprising a needlebar operatively connected to the main shaft ofthe sewing machine for thereby being moved up and down, a flat platebeing attached to the lower end of said needle-bar for movementtherewith and having axial holes therethrough, a pair of needle holderseach having an L-shape with a horizontal portion and a vertical portion,each of said needle holder horizontal portions having a groove therein,a pin pivotally supporting and connecting one end of the horizontalportion of each of said needle holders to and beneath said flat plate, avertical needle carried by each of said needle holders, a pair of zigzagcontrolling rods individually and operatively connected to the sewingmachine mechanism for providing-fancy stitching, an end portion of eachof said zigzag controlling rods being rot'atably inserted through one ofthe axial holes in said fiat plate and including a horizontal shoulderportion, and one of said shoulder portions being received in the groovein the horizontal portion of one of said needle holders and the other ofsaid shoulder portions being received in the groove in the horizontalportion of the other of said needle holders whereby an independentoscillating motion is imparted to each of said needle holders.

2. In a sewing machine having a main shaft, a housing and a mechanismfor providing fancy stitching, a needlebar device with double needleaction as claimed in claim 1, wherein said pair of needle holders arepivotally supported in an overlapped position by a common pin.

References Cited UNITED STATES PATENTS 1,383,604 7/1921 Crozet 112-4582,324,836 7/1943 Hale 1 1-2- 158 2,635,568 4/1953 Gellman et al. 1l2158XR H. HAMPTON HUNTER, Primary Examiner.

U.S. Cl. X.R. 112-221

